Facebook’s stock has fallen 43% since its much ballyhooed IPO and advertisers have questioned whether Facebook is giving them enough bang for their buck. For these reasons, there have been rumblings that Zuckerberg, Facebook’s 28-year-old CEO, is no longer the right person to be running the company he started in his college dorm room.

But now Zuckerberg at least has this big billion user milestone to hang on his critics.

That’s just a huge number. When one thinks about how many baby photos and unsolicited political opinions a billion users can create it really boggles the mind.

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